I started taking Pepcid a week ago for the pain right under my rib cage and it really worked! I'm thinking I may have an acid problem, too. However, I noticed my nausea coming back and had to stop. The other time my nausea got really bad was when I was on a strong dose of Zantac about a year ago. Has anyone else experienced this and if so found an antacid that doesn't cause this or make constipation worse? I noticed some even have Calcium in it. ------------------C-Type IBS (slow motility)